Gated

Key features

• interrupt steps pause the engine
• docs/DESIGN.md — root constraints, step model, routing, data references, gate protocol, persistence and anti-stuck design, with the decision record.
• the human approves or rejects through a panel card in the conversation.
• The model agent has no approve/reject channel — gf_advance rejects them (guard
• schema), and decisions travel straight from the panel to the engine.